connecting fault passage indicator for overhead line( Red flag
moving times no limit)
This kind of device is applied to the overhead power distribution
network automatic system from 6KV to 35KV,is used to improve the
safe and reliable operating performance through centralized
monitoring the current, temperature and fault condition on the
power distribution circuit.
when phase-to-phase short-circuit happens, it is equivalent to
directly connected between two power, there will be a very large
current flowing through the return circuit of substation and fault
point, meantime, the relay protection equipment in the substation
will start on protection according to the well-setting rules, which
will make the lines switch off. So there are 4 conditions to judge
the short-circuit fault as following:
1) there is electricity in line
2) a sudden change large current is above a certain value (this
value can be set by actual condition after leaving factory)
3) The large current duration time is not more than 3 seconds
0.02s≤△T≤3s, △T is duration of sudden change current.
4) the line will be in the state of power off in 3 seconds.
When it meets all the four conditions above, the indicators can
judge the short-circuit happened in this line and send the fault
information to central station.
Live install for Communicable FCI:
Open the package, each FCI and DTU has its own serial number, is
installed on different sites. Please install according to this
instruction as following:
Make bracket fix on the hot stick through joint bolt, each lateral
pin in both sides are dragged outwards, which make the baffle in
both sides pop-up automatically. Use hands tightly screw the
jackscrew and make the jackscrew up to the bar under the baseboard,
make sure the baseboard fixed on the top position.
Lift the compressed spring by hands, push it in the direction of
arrowhead into the slot of plastic shrapnel. Hook up another
compressed spring in
the other side in the same way.
Lift up the bracket which is together with the indicator, push it
up towards the overhead line, after the compressed spring clipping
the lines, take away the hot stick with the bracket, then the
installation is finished.
Notice: strictly prohibit persons from sitting under the indicators
during the installation process so as not to be injured.
Special Notice: please make good records for the install site and
DTU: installed on the pole same with the FCI or near the FCI, fixed
by the hoop directly, 100m away from the FCI at most.
DTU is mainly a solar control box. Open package, each solar control
box has different code, install as the following instructions:
Open the DTU, then open the power switch, the power control
indicator, solar panel indicator and load indicator will be
flashing, which means the DTU is in a normal state, close DTU and
lock it. Take off the screws connected with the holder of solar
panel and fix the solar panel.
Take down the screw nut of screw rod on hoop, install the hoop on
pole, connect Data Terminal Unit tightly through screw rod and hoop
which can be relatively rotating on pole, turn the Data Terminal
Unit to south by west direction of 10 degrees,(rotation angle is
allowed to the derivation of ±10°.then screw tightly the hoop and
DTU. Make sure fixed well.
1. No persons should stand under the device for fear of been
2.make good records of the DTU code and its installed site.
There is type test report for it, test items as following:
Type Test Items
|1. appearance and structure 2.function 3. electrical device
performance 4.low temperature performance 5.high temperature
performance 6.alternating temperature humidity7.vibrationendurance
8.incline drop test 9. electrical device life 10. static
electricity and elecro-discharge immunity test 11.radio frequency
electromagnetic field radiated immunity test 12.surge impact
immunity test 13. power frequency magnetic field immunity test. 14.
Adjacent interference test 15.short-circuit withstand impact test
16. fire hazard test 17. power consumption test 18. protection
grade test 19. gripping strength test of grip structure.|